Improvement in feed-operating mechanism for sewing-machine



Patented April 12, 1870.

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NOWELL F.

SAWYER, OF HAVERHILL, MASSACHUSETTS.

Letters Patent No. 101,926, dated April 12, 1870.

The Schedule referred to in these Letters Patent and making part of thesame To all whom it may concern:

Be it known that I, NowELL F. SAWYER, of Haverhill, in the county ofEssex and State of Massachusetts, have invented an Improvement inSewing-Machine Feeds; and I do hereby declare that the following, takenin connection with the drawings which accompany and form part of thisspecification, is a description of my invention sufiicientto enablethose skilled in the art to practice it. This invention relates to thedetail of construction and arrangement of devices in sewing-machines, bywhich is produced what is known as the four-motioned feed, and by whichthe devices, which move a serra- .ted'or roughened feeding face upwardand forward, and downward and back, are easily attached to machinesoriginally constructed with a wheel-feed.

The drawings show only those parts of a sewingmachine which arenecessary to the illustration of my invention,

Figure 1 exhibiting my improvement in end elevation, and Figure 2, inside elevation, the dotted lines 2 z representing the top of asewing-machine bed in both figures.

a represents one part of the main shaft of the machine, the shaft beingmade in two parts, each having on their adjacent ends crank-disks,connected by a crank-pin, b, which crank-pin also works aconnecting-link, c, the lower end of which takes hold of a rocker-arm,d, on the rocker-shaft e, to which partial rotations are imparted byrotation of the main shaft in the direction indicated by the arrow seenon the crank-disk in fig. 1.

0n the rocker-shaft c, at the end most remote from the feed, is pivoteda piece having a long arm, f, and a short arm, g, and on the other endof the rockershaft e is pivoted a piece, theupper arm h of which istubular, and the lower 41 of which like the arm g, forms a bearing forthe shaft and the arm 43 extends below shaft j, so that a projectionfrom arm 6, in which is made a nut, may enter a fork in the end of armk, fixed on'shaft j.

The parts are represented as attached to the machine known in the marketas the Empire machine,

in which the hangers, represented in' dotted lines in fig. 2, and marked3 3 support the rocker-shaft e,

which, in said machine, moves a pawl, which operates the feed=wheels, isan arm, I, the salient end of which bears a pin embraced by the slottedend of a bar, at,

which bears the feeder n, which is moved in a suitable slot cut throughthe sewing-machine bed or table, or a throat-piece fixed therennto.

The other end of bar m has pivoted to it a plunger, which can slide inthe tube k, which is slotted, so that a pin or roll fixed to the plungercan project through the slot in tube h, so that the roll or pin 0 can beacted upon bythecam 1), adj nstably fixed on shaft 0.

By the action .of cam 12 on the roll 0, the upward movement is given tothe arm m by the plunger in tube h, by which the feeder is projectedabove the work support. I

The connecting-rod c has upon one edge, asgseen m fig. 1, an incline, g,which, in the upward movement of rod 0, impinges against the end of armf, and imparts to it a vibration, which, throughshaft j and arms i andIt, is communicated to the feeder m, and spring 4' operates when roll 0and arm f are relieved from their motors to both draw down the feederand to draw it back.

The screw 5, which passes through the nut t, attached to arm a, servesas a means for adjusting the .length of the forward and backreciprocations of the feeder n, which is accomplished by setting, bymeans of said screw, the end of arm f relatively to the incline q, thenearer the arm f is set to the said incline, the greater will be theamount of motion which said incline will impart to said arm, and viceverse. 7

The end of shaft j, which carries the arm is and projects through thearm i, is screw-threaded, and provided with a nut, u, by which arms 70and i are clamped firmly together after the relation of said arms hasbeen determined by adjustment of screw s.

In making new machines, instead of altering old ones, the pin on whichthe slotted end of the bar at is supported and slides, will be fixed inany suitable support designed for that purpose.

1 claim the shaft j, with its arms f, g, and k, arranged as described,so as to be operated by move:

. ment of an incline on the connecting-rod c, to impart the forwardfeeding motion to the feeder n, leaving the spring 1' free at the propertime to produce the reverse movement of the feeder.

NOWELL F; SAWYER.

Witnesses J. B. (inosnv, L. H. Lumen.

